Im thinking of going with the pro comp MT's 31's,but I was wondering about how long they'll last.I'll be using them mostly on the highway, some off road, and I heard the AT wasnt much of an AT, though they do claim a long life for the price.Im just really looking for cheap,tough and long lasting,maybe a nice hum down the highway...is that so much to ask in a 31??????Any advice is always appreciated...